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1. Accurate gamma and MeV-electron track reconstruction with an ultra-low diffusion Xenon/TMA TPC at 10 atmospheres

Author

Diego Gonzalez-Diaz, V. Alvarez, F. I. G. Borges, M. Camargo, S. Carcel, S. Cebrian, A. Cervera, C. A. N. Conde, T. Dafni, J. Diaz, R. Esteve, L. M. P. Fernandes, Ferrario, P., A. L. Ferreira, Freitas, E. D. C., V. M. Gehman, A. Goldschmidt, J. J. Gomez-Cadenas, R. M. Gutierrez, J. Hauptman, J. A. Hernando Morata, D. C. Herrera, I. G. Irastorza, L. Labarga, A. Laing, I. Liubarsky, N. Lopez-March, D. Lorca, M. Losada, G. Luzon, A. Mari, J. Martin-Albo, G. Martinez-Lema, A. Martinez, T. Miller, F. Monrabal, M. Monserrate, C. M. B. Monteiro, F. J. Mora, L. M. Moutinho, J. Munoz Vidal, M. Nebot-Guinot, D. Nygren, C. A. B. Oliveira, J. Perez, Aparicio, J. L. Perez, M. Querol, J. Renner, L. Ripoll, J. Rodriguez, F. P. Santos, J. M. F. dos Santos, L. Serra, D. Shuman, A. Simon, C. Sofka, M. Sorel, J. F. Toledo, J. Torrent, Z. Tsamalaidze, J. F. C. A. Veloso, J. A. Villar, R. Webb, J. T. White, N. Yahlali, C. Azevedo, F. Aznar, D. Calvet, J. Castel, E. Ferrer-Ribas, J. A. Garcia, I. Giomataris, H. Gomez, F. J. Iguaz, A. Lagraba, A. Le Coguie, J. P. Mols, O. Sahin, A. Rodriguez, E. Ruiz-Choliz, L. Segui, A. Tomas, and R. Veenhof

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Detectors and Experimental Techniques
Abstract

We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and gamma-rays (0.511-1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in 1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3 +-0.13 mm-sigma (longitudinal), 0.8 +-0.15 mm-sigma (transverse) along 1 m drift) besides forming a convenient Penning-Fluorescent mixture. The TPC, that houses 1.1 kg of gas in its active volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8mm x 8mm x 1.2mm for approximately 10 cm/MeV-long electron tracks. This work was developed as part of the R&D program of the NEXT collaboration for future detector upgrades in the search of the 0bbnu decay in 136Xe, specifically those based on novel gas mixtures. Therefore we ultimately focus on the calorimetric and topological properties of the reconstructed MeV-electron tracks. We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and γ-rays (0.511–1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in ~1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion ( 1.3±0.13mm-σ (longitudinal), 0.95±0.20mm-σ (transverse) along 1 m drift) besides forming a convenient ‘Penning-Fluorescent’ mixture. The TPC, that houses 1.1 kg of gas in its fiducial volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8mm×8mm×1.2mm for approximately 10 cm/MeV-long electron tracks. Resolution in energy ( ε ) at full width half maximum (R) inside the fiducial volume ranged from R=14.6% (30 keV) to R=4.6%(1.275MeV) . We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and gamma-rays (0.511-1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in 1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3 +-0.13 mm-sigma (longitudinal), 0.8 +-0.15 mm-sigma (transverse) along 1 m drift) besides forming a convenient Penning-Fluorescent mixture. The TPC, that houses 1.1 kg of gas in its active volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8mm x 8mm x 1.2mm for approximately 10 cm/MeV-long electron tracks. This work was developed as part of the R&D program of the NEXT collaboration for future detector upgrades in the search of the 0bbnu decay in 136Xe, specifically those based on novel gas mixtures. Therefore we ultimately focus on the calorimetric and topological properties of the reconstructed MeV-electron tracks.

Published
2015

2. Probing the eV-Mass range for solar axions with CAST

Author

S Aune, K Barth, A Belov, S Borghi, H Brauninger, G Cantatore, J M Carmona, S A Cetin, J I Collar, T Dafni, M Davenport, C Eleftheriadis, N Elias, C Ezer, G Fanourakis, E Ferrer-Ribas, H Fischer, J Franz, P Friedrich, J Galan, A Gardikiotis, E N Gazis, T Geralis, I Giomataris, S Gninenko, H Gomez, E Gruber, T Guthorl, R Hartmann, F Haug, M D Hasinoff, D H H Hoffmann, F J Iguaz, I G Irastorza, J Jacoby, K Jakovcic, D Kang, T Karageorgopoulou, M Karuza, K Konigsmann, R Kotthaus, M Krcmar, K Kousouris, M Kuster, B Lakic, P Lang, C Lasseur, J M Laurent, A Liolios, A Ljubicic, V Lozza, G Lutz, G Luzon, D W Miller, A Mirizzi, J Morales, T Niinikoski, A Nordt, T Papaevangelou, M J Pivovaroff, G Raiteri, G Raffelt, T Rashba, H Riege, A Rodriguez, M Rosu, J Ruz, I Savvidis, Y Semertzidis, P Serpico, P S Silva, S K Solanki, R Soufli, L Stewart, A Tomas, M Tsagri, K van Bibber, T Vafeiadis, J Villar, Julia K Vogel, L Walckiers, Y Y Y Wong, S C Yildiz, K Zioutas, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, TR144753, Çetin, Serkant Ali, Yıldız, Süleyman Cenk, S., Aune, K., Barth, A., Belov, S., Borghi, H., Brauninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I., Collar, T. Dafni M., Davenport, C., Eleftheriadi, N., Elia, C., Ezer, G., Fanouraki, E., Ferrer Riba, H., Fischer, J., Franz, P., Friedrich, J., Galan, A., Gardikioti, E. N., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gomez, E., Gruber, T., Guthorl, R., Hartmann, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, I. G., Irastorza, J., Jacoby, K., Jakovcic, D., Kang, T., Karageorgopoulou, M., Karuza, K., Konigsmann, R., Kotthau, M., Krcmar, K., Kousouri, M., Kuster, B., Lakic, P., Lang, C., Lasseur, J. M., Laurent, A., Liolio, A., Ljubicic, V., Lozza, G., Lutz, G., Luzon, D. W., Miller, A., Mirizzi, J., Morale, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raiteri, G., Raffelt, T., Rashba, H., Riege, A., Rodriguez, M., Rosu, J., Ruz, I., Savvidi, Y., Semertzidi, P., Serpico, P. S., Silva, S. K., Solanki, R., Soufli, L., Stewart, A., Toma, M., Tsagri, K., Van Bibber, T., Vafeiadi, J., Villar, J. K., Vogel, L., Walckier, Y. Y. Y., Wong, S. C., Yildiz, and K., Zioutas

Subjects
Particle physics, solar axion, Second Phase, Physics::Instrumentation and Detectors, Dark matter, dark matter, X-ray Detector, Helium Gas, Phase Spaces, Current Status, Dark Matter, CERN Axion Solar Telescopes, Axion, Primakoff effect, Coupling Constants, Physics, Large Hadron Collider, Mass Regions, Axion Dark Matter Experiment, Gas Density Distribution, Solar Axions, Upper Limits, X-ray Photons, Massless particle, Strong CP Problem, solar axions, Photon detection, Strong CP problem, CERN Axion Solar Telescope, High Pressure
Abstract

Çetin, Serkant Ali (Dogus Author) -- Yıldız, Süleyman Cenk (Dogus Author) -- Conference full title: 2010 IEEE Nuclear Science Symposium conference record (NSS/MIC 2010) : [including the 2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, and the 17th International Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors (RTSD)]; Knoxville, Tennessee, USA, 30 October - 6 November 2010 The CERN Axion Solar Telescope (CAST) is searching for solar axions which could be produced in the core of the Sun via the so-called Primakoff effect. Not only would these hypothetical particles solve the strong CP problem, but they are also one of the favored candidates for dark matter. In order to look for axions originating from the Sun, CAST uses a decommissioned LHC prototype magnet. In its 10 m long magnetic field region of 9 Tesla, axions could be reconverted into X-ray photons. Different X-ray detectors are installed on both ends of the magnet, which is mounted on a structure built to follow the Sun during sunrise and sunset for a total of about 3 hours per day. The analysis of the data acquired during the first phase of the experiment with vacuum in the magnetic field region yielded the most restrictive experimental upper limit on the axion-to-photon coupling constant for axion masses up to about 0.02 eV. In order to extend the sensitivity of the experiment to a wider mass range, the CAST experiment continues its search for axions with helium in the magnet bores. In this way it is possible to restore coherence of conversion for larger masses. Changing the pressure of the helium gas enables the experiment to scan different axion masses in the range of up to about 1.2 eV. Especially at high pressures, a precise knowledge of the gas density distribution is crucial to obtain accurate results. In the first part of this second phase of CAST, 4He was used and the axion mass region was extended up to 0.39 eV, a part of phase space favored by axion models. In CAST's ongoing 3He phase the studied mass range is now being extended further. In this contribution the final results of CAST's 4He phase will be presented and the current status of the 3He run will be given. This includes latest results as well as prospects of future axion experiments. Nucl. Plasma Sci. Soc. Inst. Electr. Electron. Eng. (NPSS)

Published
2010
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4. Search for Solar Axions by the CERN Axion Solar Telescope with He3 Buffer Gas: Closing the Hot Dark Matter Gap

Author

Arik, M., Aune, S., Barth, K., Belov, A., Borghi, S., Brauninger, H., Cantatore, Giovanni, Carmona, J. M., Cetin, S. A., Da Riva, J. I. Collar E., Dafni, T., Davenport, M., Eleftheriadis, C., Elias, N., Fanourakis, G., Ferrer Ribas, E., Friedrich, P., Galan, J., Garcia, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Georgiopoulou, E., Giomataris, I., Gninenko, S., Gomez, H., Gomez Marzoa, M., Gruber, E., Guthorl, T., Hartmann, R., Hauf, S., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakovcic, K., Karuza, M., Konigsmann, K., Kotthaus, R., Krcmar, M., Kuster, M., Lakic, B., Lang, P. M., Laurent, J. M., Liolios, A., Ljubicic, A., Lozza, V., Luzon, G., Neff, S., Niinikoski, T., Nordt, A., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Riege, H., Rodriguez, A., Rosu, M., Ruz, J., Savvidis, I., Shilon, I., Silva, P. S., Solanki, S. K., Stewart, L., Tomas, A., Tsagri, M., van Bibber, K., Vafeiadis, T., Villar, J., Vogel, J. K., Yildiz, S. C., Zioutas, K., M., Arik, S., Aune, K., Barth, A., Belov, S., Borghi, H., Brauninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I. Collar E., Da Riva, T., Dafni, M., Davenport, C., Eleftheriadi, N., Elia, G., Fanouraki, E., Ferrer Riba, P., Friedrich, J., Galan, J. A., Garcia, A., Gardikioti, J. G., Garza, E. N., Gazi, T., Gerali, E., Georgiopoulou, I., Giomatari, S., Gninenko, H., Gomez, M., Gomez Marzoa, E., Gruber, T., Guthorl, R., Hartmann, S., Hauf, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, I. G., Irastorza, J., Jacoby, K., Jakovcic, M., Karuza, K., Konigsmann, R., Kotthau, M., Krcmar, M., Kuster, B., Lakic, P. M., Lang, J. M., Laurent, A., Liolio, A., Ljubicic, V., Lozza, G., Luzon, S., Neff, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raffelt, H., Riege, A., Rodriguez, M., Rosu, J., Ruz, I., Savvidi, I., Shilon, P. S., Silva, S. K., Solanki, L., Stewart, A., Toma, M., Tsagri, K., van Bibber, T., Vafeiadi, J., Villar, J. K., Vogel, S. C., Yildiz, and K., Zioutas

Subjects
solar axions, dark matter, Photon detection, solar axion, Physics::Instrumentation and Detectors, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics
Abstract

The CERN Axion Solar Telescope (CAST) has finished its search for solar axions with 3^He buffer gas, covering the search range 0.64 eV < m_a

Published
2014

5. The International Axion Observatory (IAXO)

Author

Irastorza, I. G., Avignone, F. T., Galan, J., Garcia, J. A., Geralis, T., Giomataris, I., Gninenko, S., Gomez, H., Hoffmann, D. H. H., Iguaz, F. J., Jakovcic, K., Krcmar, M., Cantatore, G., Lakic, B., Luzon, G., Lindner, A., Pivovaroff, M., Papaevangelou, T., Raffelt, G., Redondo, J., Rodriguez, A., Russenschuck, S., Ruz, J., Caspi, S., Shilon, I., Ten Kate, H., Tomas, A., Troitsky, S., van Bibber, K., Villar, J. A., Vogel, J., Walckiers, L., Zioutas, K., IAXO Collaboration, Carmona, J. M., Dafni, T., Davenport, M., Dudarev, A., Fanourakis, G., Ferrer-Ribas, E., Lindner A., Zioutas K., I. G., Irastorza, F. T., Avignone, Cantatore, Giovanni, S., Caspi, J. M., Carmona, T., Dafni, M., Davenport, A., Dudarev, G., Fanouraki, E., Ferrer Riba, J., Galan, J. A., Garcia, T., Gerali, I., Giomatari, S., Gninenko, H., Gomez, D. H. H., Hoffmann, F. J., Iguaz, K., Jakovcic, M., Krcmar, B., Lakic, G., Luzon, A., Lindner, M., Pivovaroff, T., Papaevangelou, G., Raffelt, J., Redondo, A., Rodrıguez, S., Russenschuck, J., Ruz, I., Shilon, H., Ten Kate, A., Toma, S., Troitsky, K., van Bibber, J. A., Villar, J., Vogel, L., Walckier, and K., Zioutas

Subjects
WISPs, WISP, WIMP, Axions, Physics, FOS: Physical sciences, magnetic field, coupling [photon axion], WIMPs, dark matter, astroparticle physics, High Energy Physics - Experiment, detector [axion], High Energy Physics - Experiment (hep-ex), Axion, low [background], Particle Physics - Experiment
Abstract

The International Axion Observatory (IAXO) is a new generation axion helioscope aiming at a sensitivity to the axion-photon coupling of g(alpha gamma) >~ few x 10-12 GeV**-1}, i.e. 1 - 1.5 orders of magnitude beyond the one currently achieved by CAST. The project relies on improvements in magnetic field volume together with extensive use of x-ray focusing optics and low background detectors, innovations already successfully tested in CAST. Additional physics cases of IAXO could include the detection of electron-coupled axions invoked to explain the white dwarf cooling, relic axions, and a large variety of more generic axion-like particles (ALPs) and other novel excitations at the low-energy frontier of elementary particle physics. This contribution is a summary of our recent paper \cite{Irastorza:2011gs}., Proc. of Patras Workshop on Axions, WIMPs and WISPs, 98 - 101; DESY-PROC-2011-04; ISSN 1435-8077

Published
2012
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6. CAST: Status and latest results

Author

Dafni, T., Aune, S., Davenport, M., Eleftheriadis, C., Elias, N., Ezer, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galan, J., Garcia, J. A., Gardikiotis, A., Barth, K., Gazis, E. N., Geralis, T., Giomataris, I., Gninenko, S., Gomez, H., Gruber, E., Guthorl, T., Hartmann, R., Haug, F., Hasinoff, M. D., Belov, A., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakovcic, K., Karuza, M., Konigsmann, K., Kotthaus, R., Krcmar, M., Kuster, M., Borghi, S., Lakic, B., Laurent, J. M., Liolios, A., Ljubicic, A., Lozza, V., Lutz, G., Luzon, G., Morales, J., Niinikoski, T., Nordt, A., Brauninger, H., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Rashba, T., Riege, H., Rodriguez, A., Rosu, M., Ruz, J., Savvidis, I., Silva, P. S., Cantatore, G., Solanki, S. K., Stewart, L., Tomas, A., Tsagri, M., van Bibber, K., Vafeiadis, T., Villar, J., Vogel, J. K., Yildiz, S. C., Zioutas, K., Carmona, J. M., CAST Collaboration, Cetin, S. A., Collar, J. I., K. Zioutas, M. Schumann, T., Dafni, S., Aune, K., Barth, A., Belov, S., Borghi, H., Brauninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I., Collar, M., Davenport, C., Eleftheriadi, N., Elia, C., Ezer, G., Fanouraki, E., Ferrer Riba, P., Friedrich, J., Galan, J. A., Garcia, A., Gardikioti, E. N., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gomez, E., Gruber, T., Guthorl, R., Hartmann, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, I. G., Irastorza, J., Jacoby, K., Jakovcic, M., Karuza, K., Konigsmann, R., Kotthau, M., Krcmar, M., Kuster, B., Lakic, J. M., Laurent, A., Liolio, A., Ljubicic, V., Lozza, G., Lutz, G., Luzon, J., Morale, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raffelt, T., Rashba, H., Riege, A., Rodriguez, M., Rosu, J., Ruz, I., Savvidi, P. S., Silva, S. K., Solanki, L., Stewart, A., Toma, M., Tsagri, K., van Bibber, T., Vafeiadi, J., Villar, J. K., Vogel, S. C., Yildiz, and K., Zioutas

Subjects
WISPs, solar axion, WISP, Physics, photon detectors, solar axions
Abstract

In July 2011, CAST finished the data-taking of its nominal programme, having scanned axion masses up to ~1.18 eV/c**2. Here we present the first results of the data taken in 2008, first year of the last data-taking campaign when $^3$He was used inside the magnet bores. No excess of signal over background has been recorded, and an upper limit has been set to the axion-to-photon coupling to 2.3*10**-10 GeV**-1 for axion masses between 0.39 and 0.64 eV. CAST remains the most sensitive axion helioscope and for the first time crosses the benchmark line of the KSVZ model at the upper end of the spectrum., Proc. of Patras Workshop on Axions, WIMPs and WISPs, 93 - 97; DESY-PROC-2011-04; ISSN 1435-8077

Published
2011
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